Five different sets, all complete w/window envelopes for that specific set. 1950s. Each set consists of 24 different 3x4.5" thin paper picture cards. Choice art on fronts with very detailed text backs pertaining to that specific illustration. Set titles are "Story Of Transportation, Indians Of The U.S.A., Frontiers Of Freedom, Our Friend The Dog, Good Neighbors Of The Americas." Extensive selection of topics/images including dirigible, Pony Express, Greyhound bus, Apache, Sioux, Teddy Roosevelt, Lewis And Clark, Poodle, Dalmatian, Brazil, Mexico and much, much more. Envs. have minor aging, Exc. while the cards are N.Mint to Mint.